Especially since he allowed this to be publicized, does he now have to worry about the FAA investigating him for carrying property for compensation as a student pilot?
I also wondered about him doing this as a student pilot. Clearly not business good will be obtained however.
I don't think this is cost-effective really at all. The biggest contribution in some sense was probably the father gathering up the supplies in this time of shortage. OTOH, if he was going to be flying cross-countries to accumulate the training and the time, nice to donate it to help a cause.